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| Presentation | 2019-01-11 11:25 Rotation angle estimation of watermarked regions by mode of a histogram Masato Hayashi, Masaki Kawamura (Yamaguchi Univ.)  EMM2018-89 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Digital watermarks can be embedded around SIFT feature points which have invariance of geometric transform. When an image is rotated, marked regions in the image are also rotated. Therefore, in order to extract the watermarks, it is necessary to estimate the rotation angle and then the image should be reversely rotated by the angle. The existing methods rotated the marked regions one by one and found the likely angles for all regions. Since there is uncertainty of the angles for the regions, some bit errors occur in the estimated watermarks. In this work, we propose a method for estimating the rotation angle. The estimated angle is given by the mode of the histogram of locally estimated angle in each region. Therefore, only one estimated angle in all the regions is used for restoration. We evaluated the proposed method by accuracy rate of angles and bit error rate (BER). As a result, the true angles could be estimated with high probability. However, average BERs became worse, because a wrong angle involved failure in all regions. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Watermarking / SIFT / IHC / Estimating rotation angle / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 118, no. 382, EMM2018-89, pp. 39-44, Jan. 2019. | |
| Paper # | EMM2018-89 | |
| Date of Issue | 2019-01-03 (EMM) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | EMM2018-89 |
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| Conference Information | |
| Committee | EMM |
| Conference Date | 2019-01-10 - 2019-01-11 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Sense of Presence, Universal Media, Digital Entertainment, etc. |
| Paper Information | |
| Registration To | EMM |
| Conference Code | 2019-01-EMM |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Rotation angle estimation of watermarked regions by mode of a histogram |
| Sub Title (in English) | |
| Keyword(1) | Watermarking |
| Keyword(2) | SIFT |
| Keyword(3) | IHC |
| Keyword(4) | Estimating rotation angle |
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| 1st Author's Name | Masato Hayashi |
| 1st Author's Affiliation | Yamaguchi University (Yamaguchi Univ.) |
| 2nd Author's Name | Masaki Kawamura |
| 2nd Author's Affiliation | Yamaguchi University (Yamaguchi Univ.) |
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| Speaker | Author-1 |
| Date Time | 2019-01-11 11:25:00 |
| Presentation Time | 25 minutes |
| Registration for | EMM |
| Paper # | EMM2018-89 |
| Volume (vol) | vol.118 |
| Number (no) | no.382 |
| Page | pp.39-44 |
| #Pages | 6 |
| Date of Issue | 2019-01-03 (EMM) |
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